Tennessee OEM Parts Law: What Knoxville Drivers Should Know Before Approving Collision Repairs
If you have recently been in an accident, there is a good chance the first repair estimate will be confusing.
You may see terms like OEM parts, aftermarket parts, recycled parts, remanufactured parts, or alternative parts. You may also see different opinions from the insurance company, the adjuster, and the repair facility.
The most important thing to understand is this: in Tennessee, the parts listed on your collision repair estimate are not just a preference. In some cases, they are the law.
Tennessee has specific rules involving the use of non-OEM aftermarket crash parts on newer vehicles. If your vehicle is the current model year or the immediate prior model year, non-OEM aftermarket crash parts generally cannot be used without your express permission.
That matters.
At King Collision Repair in Knoxville, we still occasionally see estimates written with aftermarket parts on vehicles that may qualify for OEM parts under Tennessee’s crash parts regulations. That is why it is so important to review your estimate before repairs begin.
What Are OEM Parts?
OEM stands for Original Equipment Manufacturer.
An OEM part is made by the same manufacturer that built your vehicle. For example, an OEM part for a Chevrolet, Ford, Toyota, Honda, Hyundai, Kia, Nissan, BMW, Mercedes-Benz, Dodge, Jeep, or GMC is designed for that specific vehicle by the original manufacturer.
OEM parts are built to match the specifications of the parts originally installed on the vehicle. That includes fit, function, mounting points, materials, and compatibility with surrounding components.
When an OEM bumper, hood, fender, headlight, bracket, reinforcement, or structural component is installed, it is designed to work with the vehicle the way the manufacturer intended.
That matters more now than it used to.
Modern vehicles are not just metal panels and paint. They often include cameras, sensors, radar units, blind spot monitoring systems, lane departure systems, adaptive cruise control, emergency braking systems, and other advanced safety technology.
A part that looks similar from the outside may not always perform the same once installed.
What Are Non-OEM Parts?
Non-OEM parts are replacement parts that are not made by the original vehicle manufacturer.
Most people know these as aftermarket parts.
Some aftermarket parts may fit acceptably. Others may create issues with alignment, gaps, mounting locations, trim fitment, sensor placement, or overall appearance.
That is one of the biggest problems with assuming all parts are the same. They are not always made by the same company, to the same specifications, or with the same consistency.
A replacement fender may look close but require extra work to line up correctly. A bumper cover may look similar but affect the way brackets, sensors, or trim pieces fit. A headlight or related mounting part may create problems that are not obvious until the repair is underway.
That is why the parts decision should not be treated like a minor detail.
What the Tennessee OEM Parts Law Says About OEM and Non-OEM Crash Parts
Tennessee’s aftermarket crash parts regulation requires disclosure when an estimate is prepared using parts supplied by a source other than the vehicle manufacturer.
The rule also says non-OEM aftermarket crash parts shall not be used on current model year or immediate prior model year vehicles without the express permission of the insured or third-party claimant.
In plain terms, if your vehicle is new enough to fall under that rule, aftermarket crash parts should not simply be placed on the estimate and used without your permission.
This does not mean every repair on every vehicle automatically gets OEM parts. Vehicle age, insurance policy language, the type of part, availability, and the details of the claim can all matter. Here at King Collision, we always use OEM parts whenever possible.
Why This Law Matters for Tennessee Drivers
After an accident, many customers assume the insurance estimate is final.
It is not.
An estimate is a starting point. It is written based on what the adjuster can see, what has been approved so far, and what parts have been selected at that stage of the claim.
If your estimate includes aftermarket crash parts, and your vehicle is a current model year or immediate prior model year vehicle, that should raise a question.
Did you give express permission for those non-OEM aftermarket parts?
Were the parts clearly disclosed?
Were you told what kind of parts were being used?
Do you understand whether the warranty on those parts comes from the vehicle manufacturer or from the aftermarket part supplier?
These are fair questions. You are not being difficult by asking them. You are trying to understand what is being installed on your vehicle.
Why Insurance Estimates May Include Aftermarket Parts
Insurance companies often write estimates with alternative or aftermarket parts because those parts may cost less than OEM parts.
That does not automatically mean the part is unsafe or unusable. It does mean the part may not be identical to the original manufacturer part.
Insurance companies are businesses. Controlling claim costs is part of their process.
Your repair facility’s job is different.
A quality collision repair shop is looking at fit, finish, safety systems, manufacturer repair procedures, long-term performance, and whether the repair can be completed properly.
That is why it is important to have a repair facility review the estimate instead of assuming everything on it is correct.
The Estimate Should Be Reviewed Before Repairs Begin
If you bring your vehicle to King Collision Repair, we review the estimate, inspect the damage, and look at the parts listed for the repair.
That review matters because the original estimate may not include everything needed to repair the vehicle correctly.
Sometimes damage is hidden until teardown. Sometimes parts are listed incorrectly. Sometimes the estimate includes aftermarket parts where OEM parts should be discussed. Sometimes the repair procedure requires additional steps that were not included at first.
This is normal in collision repair.
Why OEM Parts Matter for Safety
Vehicle manufacturers design their parts to work as part of a complete system.
That includes structural components, impact absorbers, brackets, sensors, cameras, reinforcements, bumper systems, and mounting locations.
When a collision happens, the vehicle is designed to manage impact energy in a specific way. The parts used in the repair can affect how closely the repair follows the manufacturer’s original design.
This becomes especially important on newer vehicles with advanced driver assistance systems.
Features like blind spot monitoring, lane departure warning, adaptive cruise control, automatic emergency braking, and collision avoidance systems depend on accurate sensor placement and proper component fit.
Even small differences can create problems during repair, calibration, or final performance.
That is one reason we take parts selection seriously.
Why Fit and Finish Still Matter
Most customers want their vehicle to look like the accident never happened.
That result depends heavily on the parts used.
OEM parts are designed for that specific vehicle. They usually provide more consistent fitment, body lines, panel gaps, mounting locations, and overall appearance.
With aftermarket parts, technicians may run into issues that require additional adjustment. Sometimes those issues can be corrected. Sometimes they create unnecessary difficulty. Sometimes the part simply does not match the original as closely as it should.
A clean repair is not just about paint. It starts with the foundation.
If the part does not fit properly, everything after costs more time and money.
What You Should Look For on Your Estimate
Before approving collision repairs, look closely at the parts section of the estimate.
You may see abbreviations or descriptions that identify the part type. If anything says aftermarket, non-OEM, alternative, reconditioned, remanufactured, recycled, LKQ, or used, ask the repair facility to explain what that means.
Also ask whether your vehicle falls under Tennessee’s current model year or immediate prior model year rule for non-OEM aftermarket crash parts.
You do not need to understand every line of a collision estimate by yourself. That’s what we’re here for.
Helpful Links
Here are a few helpful resources if you want to read more about Tennessee crash parts rules, insurance questions, and modern vehicle safety systems:
Tennessee Aftermarket Crash Parts Regulation
Tennessee Rule 0780-01-59-.04 on Cornell Legal Information Institute
Tennessee Department of Commerce and Insurance Consumer Resources
File an Insurance Complaint in Tennessee
NHTSA Driver Assistance Technologies
This information is provided for general education and should not be treated as legal advice. If you have a specific legal question about your claim, policy, or rights, you should speak with the appropriate state agency or a qualified attorney.
Final Thoughts
The parts used in a collision repair matter.
They can affect safety, fit, appearance, value, calibration, and long-term confidence in the repair. In Tennessee, they may also involve specific disclosure and permission requirements when non-OEM aftermarket crash parts are listed for newer vehicles.
Do not assume the first estimate tells the whole story.
If you have been in an accident, have your estimate reviewed before repairs begin. If aftermarket parts are listed, ask why. If your vehicle is the current model year or the immediate prior model year, ask whether Tennessee’s OEM crash parts rule applies.
At King Collision Repair, we believe customers deserve to know what is being installed on their vehicle and why. Our job is not just to make the damage disappear. Our job is to help make sure the repair is handled properly from start to finish, and when you get your keys back, you leave with the peace of mind of a lifetime guarantee.
If you have questions about the parts listed on your estimate, bring it to King Collision Repair here in Knoxville. We will review it with you, explain what the estimate says, and help you understand your options before the repair moves forward.
Protect your right to a safe and proper repair.